package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;



@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {


    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareOrderTaskService wareOrderTaskService;

    @Autowired
    private WareOrderTaskDetailService wareOrderTaskDetailService;



    @Autowired
    private OrderFeignService orderFeignService;
    /**
     * 1、库存自动解锁。
     *    下订单成功，库存锁定成功，接下来业务调用失败，导致业务回滚，之前锁定库存解锁.
     * 2、订单失败
     *    锁库存失败
     *
     * 只要解锁库存的消息失败。一定要告诉服务解锁失败。  启动手动消息应答ack模式
     *
     */


    //解锁库存方法
    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){

        //库存解锁
         wareSkuDao.unLockStock(skuId,wareId,num);
         //更新库存工作单状态
        WareOrderTaskDetailEntity wareOrderTaskDetailEntity = new WareOrderTaskDetailEntity();
        wareOrderTaskDetailEntity.setId(taskDetailId);
        wareOrderTaskDetailEntity.setLockStatus(2);//变为已解锁
        wareOrderTaskDetailService.getById(wareOrderTaskDetailEntity);
    }



    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        QueryWrapper<WareSkuEntity> wareSkuEntityQueryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            wareSkuEntityQueryWrapper.eq("sku_ID",skuId);
        }
        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            wareSkuEntityQueryWrapper.eq("ware_id",wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wareSkuEntityQueryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(wareSkuEntities == null || wareSkuEntities.size()==0){
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字,如果失败，整个事务不需要回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现不回滚
            try{
              R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if(info.getCode() == 0){
                wareSkuEntity.setSkuName((String) data.get("skuName"));
              }
              }catch (Exception e){

            }

            wareSkuDao.insert(wareSkuEntity);
        }else {
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStack(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null?false:count>0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }


    /**
     * 为某个订单锁定库存
     *
     * 库存解锁场景，
     * 1、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消
     * 2、下订单成功，库存锁定成功，接下来业务调用失败，导致业务回滚，之前锁定库存解锁
     * @param vo
     * @return
     */

    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单详情。
         * 追溯哪个仓库锁了多少。
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);
        //1、按照下单的收货地址，找到就近仓库，锁定库存

        //1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());


        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if(wareIds == null || wareIds.size() == 0){
                //所有仓库都没库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2、如果锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到ID，所以
            //就不用解锁，但是不合理

            for (Long wareId : wareIds){
                //成功就返回1，否则是0
                 Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                 if(count == 1){
                     skuStocked = true;
                     //TODO 告诉MQ库存锁定成功。
                     WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(),taskEntity.getId(),wareId,1);
                     wareOrderTaskDetailService.save(detailEntity);

                     StockLockedTo stockLockedTo = new StockLockedTo();
                     stockLockedTo.setId(taskEntity.getId());
                     StockDetailTo stockDetailTo = new StockDetailTo();
                     BeanUtils.copyProperties(detailEntity,stockDetailTo);
                     //只发id不行，防止回滚之后，找不到数据
                     stockLockedTo.setDetail(stockDetailTo);
                     rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",stockLockedTo);
                     break;
                 }else {
                     //当前仓库锁失败，重试下一个仓库
                 }
            }
            if (skuStocked == false){
                // 当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        //3、肯定全部都是锁定成功的

        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

            Long id = to.getId();//库存工作单的id；
            StockDetailTo detail = to.getDetail();
            Long skuId = detail.getSkuId();
            Long detailId = detail.getId();
            //1、查询数据库关于这个订单的锁定库存信息
            //有 ：证明库存锁定成功了
            //解锁：订单情况
            //  1、没有这个订单。必须解锁
            //  2、有这个订单。
            //订单状态：  已取消：解锁库存，；    没取消：不能解锁
            //没有 ： 库存锁定失败了，库存回滚了。这种情况无需解锁

            WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
            if(byId!=null){
                //解锁
                WareOrderTaskEntity wareOrderTaskEntity = wareOrderTaskService.getById(to.getId());
                String orderSn = wareOrderTaskEntity.getOrderSn();//根据订单号查询订单状态
                R r = orderFeignService.getOrderStatus(orderSn);
                if(r.getCode()==0){
                    //订单数据返回成功
                    OrderVo orderVo = r.getData(new TypeReference<OrderVo>(){});
                    if(orderVo.getStatus() == 4 || orderVo == null){
                        //订单不存在
                        //订单已经被取消了。才能解锁库存
                        //detailId
                        if(byId.getLockStatus() == 1){
                            //当前库存工作单详情，状态1 已锁定但是未解锁才可以解锁
                            unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                            // channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
                        }

                    }
                }else {
                    //channel.basicAck(message.getMessageProperties().getDeliveryTag(),false);
                    //消息拒绝以后重新放到队列里面。让别人继续消费解锁
                    //  channel.basicReject(message.getMessageProperties().getDeliveryTag(),true);
                    throw new RuntimeException("远程服务失败");
                }
            }else {
                //无需解锁
            }

    }


    //防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期，查订单状态新建状态，什么都不做就走了
    //导致卡顿订单永远不能解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {

        String orderSn = orderTo.getOrderSn();
        //查一下最新库存解锁状态，防止重复解锁
       WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long taskId = task.getId();
        //按照工作单找到所有没有解锁的的库存，进行解锁
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", taskId)
                        .eq("lock_status", 1));
        //Long skuId,Long wareId,Integer num,Long taskDetailId
        if(list.size()>0){
        for (WareOrderTaskDetailEntity entity : list){
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
        }

    }


    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}